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go to engineering mode http://www.iphoneclone.de/SciPhone/SciPhone-Engineer-mode/Index.html and change microphone volume to a value of 6. I had the same problem, my microphone level had been at zero. Good luck and best regards. Hansi

Are you using a bluetooth headset or using the Sidekick as is? One of the problems might be that you have your handset volume turned up too high so that the incoming audio gets fed back through the microphone. Try turning down the sound and see if that helps.